Dental tool



G. SIBLEY;

DENTAL TOOL.

(No Model.)

No. 416,426. Patented Dec. 3, 1889.

R O T N E V m WITN ESSES N4 PETERS. Pmwumo mphm, W-flhinglolL l1 0.

.UNITED' STATES PATENT OFFICE.

GIDEON SIBLEY, OF PHILADELPHIA, PENNSYLVANIA.

DENTAL TOOL.

V SPECIFICATION forming part of Letters Patent No. 416,426, datedDecember 3, 1889.

Applicationfiled June 1 8 1888.

To all whom it may concern.-

. Be it known'that I, GIDEoN SIBLEY, a citizen of the United States,residing at the city and county of Philadelphia, and State of 5Pennsylvania, have invented certain new and useful Improvements inDental Implements, of which the following is a full, clear, and eX- actdescription, reference being had to the accompanying drawings, of which-Figure l is a side elevation. Fig. 2 is a longitudinal sectionalelevation of the working end thereof, enlarged, the pin being shown inits normal or projected position. Fig. 3 is a similar view, with the pinretracted. Fig.

4 is a perspective View of theworking end of the implement.

The nature and object of this invention is a ,dental implement forpicking up gold or other filling materials and conveying the same zo-tothe cavity in the tooth to be filled, and

also adapted for plugging or working the filling into the cavity.Heretofore it has been customary to pick up the filling and convey it tothe tooth, either by a pair of pinchers or the usual serrated workingend of the pluggingtool, the latter being pressed down upon the I gold,&c.; but the manipulation by the pinchers was slow, and the serrationscould not be always relied upon for retaining the gold, &c.;

and with -both devices the filling was apt to become somewhat condensedbefore its 'insertion'in the tooth-cavity.

My improvement avoids these objections; and it consists, generally, of asuitable han- 3 5 dle such as is common in dental filling-toolshavingcombined therewith at its small or operating end a movable sharp-pointedpin or needle, whose point is adapted to be projected a short distancebeyond said operating end,

40 and to be retracted so as not to thus project,

when inserted by the retraction of the pin.

' The invention consists, further, in the combination, with the devicesjust recited, of a spring for keeping the point of the pin normallyprojected beyond the operating end of the implement, but allowing itseasy retraction, as hereinafter described.

The invention further consists in certain Serial No. 277,418. (Nomodel.)

special details of construction, which will be hereinafter described andduly claimed.

I shall now proceed to describe that which I consider the most desirableform and construction of the invention.

Referring to the annexed drawings, A is a handle-such as is usual indental fillingtools-with its small or working end a preferably, but notnecessarily, at an angle thereto,'as shown. This end is perforatedcentrally and contains a movable needle-pointed pin B, preferably ofsteel, the point I) being kept normally projected-say, one-sixteenth ofan inch.by means, in the p'resentinstance, of a flat spring 0, which issecured to the handle by screws 12 and bears against the head of thepin. The hole a in the head a has an offset a therein against whichabuts a corresponding shoulder 72*, formed on the pin B. Thus theprojection of the pin is limited. When the head a is inclined, as shown,I prefer to give the adjacent part of the handle a bend, as at a*, andto correspondingly bend the free end of the spring 0, whereby a moredirect pressure is exerted by the spring upon the pin.

In using the "implement the pin end is pressed down upon the gold orother filling material, and the pin will enter the latter, and, owing tothe friction, the material will be picked up when the tool is raised,and may be conveyed to the cavity in the tooth and then pressed into thelatter by means of the working end a, through which the pin projects.The filling is not drawn out by the pin in the plugging operation, asthe hold of the former in the cavity into which it has been forced isgreater than that-i. e., the friction-01. the pin, and the pin,retracting under slight pressure, is not forced into thealready-compacted filling by the pressure of the end of the implementduring the operation.

I remark that the end of the implement is or may be serrated, as iscustomary in dental plugging-tools.

I do not limit myself to the special construction shown and described,as the device may be variously modified without departing from theessential principle thereof-as, for example, in lieu of the spring forprojecting the connected with the pin and adapted to be operated by thefinger to project or retract the pin-point; and, again, instead of theflat spring shown a spiral spring may be used; and, also the pin may bestraight or in line longitudinally with the handle instead of inclinedwith respect thereto.

Having thus described my invention, I claim as new and wish to securebyLetters Patent 1. In adental plugging or fillingimpleinent, thecombination of the handle and the movable needle-pointed pin at theworking end thereof, said pin projecting slightly beyond said workingend, so as to readily pick up the filling material when pressed down,and then be retracted, so as to release the latter and thereby permitthe said working end to be used to force the filling into the cavity ofthe tooth, substantially as described.

2. In a dental pluggingorfillingimplement,

the combination of the handle, the movable needle-pointed pin at theWorking end there of, and the spring adapted to normally project saidpin slightly beyond said working end, substantially as described.

3. In a dental filling or plugging implement, the combination of thehandle provided with the inclined perforated end, and the offset or benda", the pin contained in said end, and the fiat bent spring 0, securedto the handle and bearing against said pin, substantially as and for thepurpose set forth.

In testimony whereof I have hereunto affixed my signature this 12th dayof June, A. D. 1888.

GIDEON SIBLEY.

Vitnesses:

GEORGE W. CLEMENT, llU GH A. TONER.

